Full-stroke mechanism and overthrow-preventer for adding-machines.



W, J. PASINSKI.

FULL STROKE MECHANISM AND OVERTHROW PHEVENTER FOR ADDING MACHINES.

APPLICATION FILED JULY 30.1915.

1,229,508., Patented June 12, 1917.

WITNESSES M ATTORNEYS unites strains tanner omen.

WALTER d. PASIN SKI, OF DETROIT. MICHIGAN, ASSIGNOR 1'0 BUBROUGHS ADDING MACHINE COMPANY, 0F DETROIT, MICHIGAN,A CORPORATION OF MICHIGAN.

FULL-STRDKE MECHANISM AND OVER'IHROW-PREVENTER FOR ADDING-MAGHINES,

To all whom it may concern: Be it known that I, WALTER J. PAsINsKI, a citizen of the United States, residing at Detroit, in the county of Wayne and State.v

has been devised for application to an adding machine ofthe general type of that disclosed in my prior Patent 1,023,168 issued April 16, 1912 (see also Patent 1,016,501 issued February 6, 1912, upon the invention of Allen A. Horton) and this present invention relates to control of the handle whichefi'ects the forward turning to zero of the registering wheels when the machine is to be made ready for a new series of operations. Violent use of this handle may be practised to the injury of the registering mechanism or may, through the rebound of arresting devices, result in over-rotation of the wheels so that instead of being left showing zeros one or more of them may exhibit digits which condition if observed necessi tates a second operation of the handle and if not observedleads to erroneous registration in subsequent operations of the machine. Erroneous results may also be brought about by shortstroking the handle. Thus, through ignorance or inexperience, or other cause, or with wilful intent to misoperate the machine, the handle, after having been pulled forward, may be let return then pulled forward again.

llhe object of the present invention. is to effectively guard against any such damaging or objectionable effects as above referred to and I accomplish my object through employment of one and the same devices for checking eiicessive speed of movement of the zeroizing handle and for compelling a full stroke thereof. I am aware that these things separately considered are not novel but I believe it to be new with meto combine these functions in one and the same device or set of devices.

In the drawings which accompany and form a part of t is specification, Figure 1 represents in left side elevation a portion of an adding machine of the type above referred to, said machine being equipped with means for carrying out my invention and all Specification of Letters Patent.

part way and Patented June 112. 1917;

Application filed July 30, 1915. Serial No. 42,697.

parts being shown at. normal; Fig. 2 is a fragmentary side elevation of some of the same parts but illustrates a condition during forward movement of the zeroizing handle at normal speed; Fig. 3 is a similar View illustrating the effect of driving forward said handle at excessive speed; Fig. 4 is a 0 similar view illustrating the full'stroke function of the same means.

As above stated the machine which I have chosen for purposes of detailinga specific embodiment of my invention, is of the genaforeeral type of that illustrated in my said prior patent. The machine illustrated is in fact one of a somewhat later construction but it is unnecessary to describe the of the machine illustrated in my aforesaid prior patent, the driving means for the zeroizing mechanism comprises a rock shaft 4, a crank arm 5 secured thereto, and springconnected'links 6 by which said crank arm is coupled to a crank arm 7 fastened to the handle shaft 8. The handle itself is designated by the numeral 9 and is designed as usual to be locked to said shaft. The above described driving devices are as usual held rearward normally by a spring 10.

Referring now to the devices applied to said driving means in the carrying out of my invention, there is formed integral with the crank arm 7 a segmental plate 11 having along its upper edge a series of rack teeth 12. These are somewhat widely spaced apart and their front faces are abrupt or substantially radial to the shaft 8, whereas their rear faces are inclined. Rearwardly beyond this series of teeth there is a deep notch 13 in said segmental plate, the bottom of this notch merging into the back of the rearmosttooth 12.

A pawl 14 is centrally pivoted to a side plate of the machine in the same general vertical plane which the crank arm and segmental plate occupy. This pawl is of angular form and comprises a forwardly and a applied to the rearwardly extending arm normally holds it elevated and holds the forwardly extending arm correspondingly depressed. In' the normal rearward pos tion of the segment 11 it stands rearward of thls forward arm of the pawl, as illustrated in Fig. 1. The position of the pawl as yieldingly maintained by the spring 15 is such that the lower corner of the forward arm of the pawl is directly in the path of movement of the teeth 12 of said segment, and the disposition of the pawl end is such that this lower corner thereof functions as a cam nose in cooperation'with said teeth as the handle 9 is pulled forward. The dimensions of the pawl and the spacing of the teeth are such that the pawl spans the distance between three of the teeth. The camming action between the front end of the pawl and a forward tooth of the rack results in rocking the pawl in opposition to the spring 15 and thereby moving the end of the rear arm of the pawl toward the rack. In

"normal speed of movement of the zeroizing handle the effect is that illustrated in. Fig. 2, said rear end of the body simply approaching the rack without interposing itself in the path of a tooth thereof. The end edge of this rear arm of the pawl is abrupt in" character, for the purpose of blocking the handle in its forward movement under excessive speed. The effect under such conditions is illustrated in Fig. 3. Excessive speed of forward movement of the zeroizing handle will throw the forward arm of the pawl off theforward rack tooth and thereby the rear end of the pawl will be thrown into the path of the abrupt forward face of a rear tooth of the rack- In the above described manner the machine will be protected against violent application of force to drive the zeroizing handle forward, and over-throw effects will be guarded against. I

Passing now to the matter of compelling a full rearward stroke of the zeroizing handle, I utilizethe same pawl 14 for thispurpose, which functions as above described to regulate the speed of movement of the handle. The deep notch 13, before mentioned, comes into play in' connection with compelling full strokes. The spring 15 is constantly tending to hold the pawl in the .position illustrated in Fig. 1 and when the handle has been pulled all the way forward, the rearmost tooth 12 will have passed by the front end of the pawl. Then the deep notch 13 comes under the pawl .and permits it to be swung to its normal position by the spring '15. Then when the handle moves rearward the inclined backs of the rack teeth 12 will successively wipe past the pawl, as illustrated inFig. 4. The spring 15 being centralized with reference to the pivot of the pawl will in this wiping operation be swung upwardly and distended above the center line, or line running from the fixed supporting spring stud to the pawl pivot stud. The spring will therefore throw the pawl in front of the rack teeth as the latter wipe past the point of the pawl, so that any reverse movement of the handle will be obstructed by encounter of the abrupt front edge or face of a tooth against the end edge of the pawl, until the handle has partaken ofits full rearward stroke and the last or foremost tooth as passed by the pawl. Then of course the pawl reassumes its normal position.

1am of course aware that full stroke pawls having the above described tumbling action are well known, and I am likewise aware that a speed controllin action of the character of that above descri ed is old, and I do not herein claim either of these things per se, but only the combination whereby, through the same set of devices I am enabled to obtain both results.

I claim:

1. The combination with a reciprocating handle, of means checking its movement when driven beyond desired speed, and ooment in one direction beforerever'sing.

2. The combination with a movablehan die, of a rack and pawl one of which is carried by the handle and theother of which is fixed, the pawl being pivoted intermediate its ends and spring-held in camming relation to the teeth of the rack at one end and adapted under momentum to engage the teeth at its other end and thereby arrest the motion of the'handle, together with provisions for compelling a full stroke of the handle.

3. The combination with a movable handle, of a rack and pawl one of which is carried by the handle and the other of which is fixed, the pawl being pivoted intermediate its ends and spring-held in camming relation to the teeth of the rack at one end and adapted under momentum to engage the teeth at its other end and thereby arrest the motion of the handle together with means for tumbling the pawl to, constitute it a means for compelling a full stroke of the handle.

4. The combination with a movablehandie, of a rack and pawl one ofwhich is car ried by the handle and the other of which is serving, through coaction with-t the rackteeth, to compel a full stroke of'the handle in the oppositedirection.

eeehoe 5. The combination with an oscillating Ward facing abrupt edges, said rack having handle, of a segmental rack carriedthereby a deep notch beyond the series of teeth; a and having Widely spaced teeth With forpivoted pawl with a cam-nose on one side of Ward facing ebrupt edges, said rack having its pivot and a relatively abrupt nose on the a deep notch beyond the series of teeth; a other side of its pivot; and a spring holding pivoted pawl with a cam-nose on one side of the oam-nose normally in the path of the its pivot and a relatively abrupt nose on the rack-teeth, the abrupt nose adapted under other side of its pivot; and a spring holdin momentum to engage the abrupt edges of the the cam-nose normally in the path of the rack teeth and thereby arrest the handle, rack-teeth, the abrupt nose adapted under and the cam-nose adapted to enter the deep momentum to engn the abrupt edges of notch of the rack as the handle completes its the rack teeth and thereby arrest the handle, initial stroke and to then cooperate with the and the earn-nose adapted to enter the deep rack-teeth to compel a complete return stroke notch of the rack as the handle completes its of the handle, the said spring; crossing the initial. stroke and to then cooperate with the line between its fixed point (if attachment rack-teeth to eom e1 (2on1 alete return and the :ZtWl ivot" P l P stroke of the haiidle. WALTER J. PASENSKI.

6. The combination wlth an oscillating Witnesses: handle, of a segmental rack carried thereby J. A, BROIHY,

and having Widely spaced teeth with ten S. MIELERT. 

